<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>

    <link rel="stylesheet" href="js/layui/css/layui.css">
</head>
<body>
    <script src="js/layui/layui.js"></script>
    <script>
        //一般直接写在一个js文件中
        layui.use(['layer', 'form'], function(){
            var layer = layui.layer
                ,form = layui.form;

            layer.msg('Hello World');
        });
    </script>
</body>
</html>